Lower South East Marine Park is a marine protected area in the Australian state of South Australia located in the state's coastal waters in the state’s south-east adjoining the border with the state of Victoria. The marine park was established on 29 January 2009 by proclamation under the Marine Parks Act 2007 and its extent was subsequently varied on 23 July 2009. The marine park is divided into zones to managing the marine environment to ensure varying degrees of “protection for habitats and biodiversity” and varying levels of “ecologically sustainable development and use” as follows: